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Compact DC Josephson Voltage Standard



Alain Rufenacht, Anna E. Fox, Grace E. Butler, Charles J. Burroughs, Paul D. Dresselhaus, Robert E. Schwall, Stefan Cular, Samuel P. Benz


This paper presents precision measurements with a prototype cryogen-liquid-free DC Josephson voltage standard that produces a 1 V maximum output. Its cryostat is sufficiently compact that it can be operated on a bench close to devices under test. Compared to the National Institute of Standards and Technology (NIST) programmable Josephson voltage standard (PJVS), this bench-top Josephson voltage standard (BJVS) has a smaller cryostat (only 25 % of the volume), the Josephson junction array circuit is less complex and has only 10% as many junctions, simpler bias electronics, and reduced mechanical cooling requirements. Direct voltage comparison between the BJVS and the PJVS achieved a relative agreement of 5x10−10 at 1 V. With the recent redefinition of the International System of Units (SI), the BJVS becomes a primary realization the unit volt, requiring only access to a standard single-phase power outlet and a GPS signal (SI second).
Proceedings Title
2020 Conference on Precision Electromagnetic Measurements
Conference Dates
August 24-28, 2020
Conference Location
Denver, CO


precision measurements, prototype cryogen-liquid-free DC Josephson voltage standard, 1 V maximum output, cryostat, NIST, programmable Josephson voltage standard, PJVS, bench-top Josephson voltage standard, BJVS, bench-top Josephson voltage standard, International System of Units, SI, standard single-phase power outlet circuits, voltage measurement, GPS signal


Rufenacht, A. , Fox, A. , Butler, G. , Burroughs, C. , Dresselhaus, P. , Schwall, R. , Cular, S. and Benz, S. (2020), Compact DC Josephson Voltage Standard, 2020 Conference on Precision Electromagnetic Measurements, Denver, CO, [online], (Accessed May 23, 2024)


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Created August 23, 2020, Updated September 28, 2020